I took the liberty of looking up all the buffs and nerfs since update 14825.
If I forget something, let me know please!
Buff
Starting Resources: Starting Goat is now semi-fattened (contains 70 additional food)
(18214) Starting resources: Now begin with a Goat (previously a semi-fattened Goat)
(14825)
UNITS & BUILDINGS
Village: Reduced cost from 190 
180 wood. XP bounties and build time have been adjusted accordingly.
Summer Palace: Reduced the amount of time before the Territorial Army is granted for free from 210 195 seconds.
Forbidden Army: Decreased training time from 33 29 seconds.
Asian Monastery: Now trickles 0.7 XP/s
CARDS
9 Keshiks (III) 10 Keshiks (III)
24 Rattan Shields (IV) 26 Rattan Shields (IV)
Standard Army Hit Points (II): Increased the hit point bonus for Steppe Riders and Chu Ko Nu from +15% +20%.
Beiyang Army (III): Reduced the food cost of the card—which delivers 8 Keshik, 8 Steppe Riders, and activates their Disciplined upgrades—from 1000 750 food.
Several changes have been made to the New Army (III) card:
Moved from Age 3 Age 2.
Cost increased from 200 500 food.
(20332) New Army (II): Reduced food cost from 500 400 food.
Note that Arquebusiers and Changdao Swordsmen do not reach their more powerful, Disciplined status until the Fortress Age.
(61213)
[NEW] Tea Export (I): “Ships 1 Consulate Rickshaw and 100 Export to spend. Also grants a steady trickle of Export permanently.”
[NEW] 1 Flying Crow (III): “Ships 1 Flying Crow.”
[NEW] Fire Dragon Manual (IV): “Ships 1 Flying Crow and 2 Honored Flamethrowers. Slightly improves their rate of fire.” (10%)
[NEW] Year of the Tiger (I): “For each 2 Disciples you have lost, a Pet White Tiger will be mustered to your homecity spawn point (up to a maximum of 12 units).”
[NEW] Year of the Dragon (III): “Each Town Center will muster 1 Flamethrower and each Village will muster 1 Monitor Lizard, to your homecity spawn point.”
[NEW] Koxinga (500c, IV): “Ships 11 Iron Troops and significantly improves their ranged rate of fire.”
[NEW] 1 Flamethrower + 1 Castle Rickshaw (II): “Ships 1 Flamethrower and 1 Castle Rickshaw.”
2 Flamethrowers (III): Updated to 2 Flamethrowers and 1 Castle Rickshaw
4 Flamethrowers (IV): Updated to 4 Flamethrowers and 1 Castle Rickshaw
UPGRADES
German Relations (Consulate): Fixed an exploit where trained units which were unable to spawn (due to space limitations) would refund more resources than they cost to initially train.
German Relations (Consulate): Moved Food Trickle (II) to Age 1.
German Relations (Consulate): Moved Wood Trickle (III) to Age 2.
German Relations (Consulate): Moved Coin Trickle (IV) to Age 3.
(13690) Consulate German Relations: Banner Army food cost reduction improvement reduced to 15% (from 20%)
CONSULATE
(14825)
German Relations (Consulate): The German Expeditionary Army now grants 1 Heavy Cannon and 18 Needle Guns (was 2 Heavy Cannons and 11 Needle Guns)
(61213)
Consulate (German Relations): Adjusted as follows
Food Trickle (I, 250e): Export cost reduced to 200 (from 250)
Coin Trickle (III, 250e): Trickle increased to 1.65 c/s (from 1.25)
Consulate (Russian Relations):
Passive Bonus: Now improves Villager train time and cost by 10% (previously just train time)
Blockhouse (II, 250e): Now available in Age I; Export cost reduced to 225 (from 250); now properly trains all War Academy and Castle units (Flamethrowers and Hand Mortars were previously missing)
Consulate (French Relations):
Food Crates (II): Moved to Exploration Age, now ships 300 food (down from 500); Export cost reduced to 150 (from 300)
Wood Crates (II): No change
Coin Crates (II): Moved to Fortress Age, now ships 700 coin (up from 500); Export cost increased to 450 (from 300)